The effect of spatial scale on evenness

J N Wilson, John B Steel, Habiba Gitay

    Research output: Contribution to journalArticle

    Abstract

    The effect of spatial scale on species evenness has not previously been investigated. As the area of each sample of vegetation (i.e. the spatial grain) increases, evenness could in theory increase, decrease, or stay the same, though the simplest model predicts an increase. We use biomass data from four dune slack sites and two semi-arid grasslands, sampled to allow calculation of evenness at a range of spatial grains. In all six sites, evenness decreases as grain size increases, almost monotonically. It is hypothesized that such a pattern is a result of a general feature of plant species abundance distributions and of vegetation response to environmental microheterogeneity.
    Original languageEnglish
    Pages (from-to)463-468
    JournalJournal of Vegetation Science
    Volume10
    Publication statusPublished - 1999

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